The divergence between the two populations of Rhagoletis must have occurred very rapidly because
A) The apple tree was imported into North America with European settlement approximately 200 years ago
B) Flies were imported into North America with European settlement approximately 200 years ago.
C) Long-distance rail transport of fruit increased only after the American Civil War
D) Heavy use of gunpowder during the American Civil War led to increased mutation rates in many natural populations of plants and animals.
Ans: A) The apple tree was imported into North America with European settlement approximately 200 years ago
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At the summit of a high mountain, the atmospheric pressure is 380 mm Hg. If the atmosphere is still composed of 21percent oxygen, then the partial pressure of oxygen at this altitude is about _____
A) 0 mm Hg B) 80 mm Hg C) 160 mm Hg D) 380 mm Hg E) 760 mm Hg
Heritability is measured as:
A. the slope of the line that relates the average phenotype of parents to the average phenotype of their offspring. B. the slope of the line that relates the average phenotype of parents to the average environment in which they live. C. the slope of the line that relates individual phenotype to environmental conditions. D. the degree of skewness of the distribution of offspring phenotypes. E. the difference between the norms of reaction of two phenotypes across the same range of environmental conditions.
If long or round are homozygous forms of an
incompletely dominant gene, and oval is the phenotype of the heterozygote, give the F2 ratio of the cross between long and round (both genotype and phenotype). What will be an ideal response?
Biotechnology can be said to have ancient roots. Explain
What will be an ideal response?